<!DOCTYPE html>
<html lang="zh-cn">
<head>
	<meta charset="utf-8">
	<title>016-并集选择器.html</title>
	<style>
		/*div.www,p.www2{
			color: red;
		}*/
		span,p.www2,#p1{
			color: blue;
		}
	</style>
</head>
<body>
	<div class="www">div</div>
	<p class="www">p</p>
	<span class="www www2">span</span>
	<p class="www2">p</p>
	<div class="www2">div</div>
	<p id="p1">p</p>
</body>
</html>